Role of Oxygenated Fatty Acids in Rice Phytoalexin Production(Pesticide Chemistry)

概要

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13-Hydroperoxides (ROOH) and 13-hydroxides (ROH) of both linoleic and linolenic acids rapidly increased after inoculating press-injured spots of rice leaves with Pyricularia oryzae. The highest concentrations of ROOH and ROH were reached within 24 hr after inoculating with P. oryzae. On the contrary, the production of momilactone A, a terpenoid rice phytoalexin, began 24 hr after inoculating with P. oryzae, while the momilactone A level peaked at 96 hr after the inoculation. The 13-hydroperoxides and 13-hydroxides of linoleic and linolenic acids can thus induce phytoalexins production. Quinacrine, an inhibitor of phospholipase A_2, and the lipoxygenase inhibitor, nor-dihydroguaiaretic acid (NDGA), inhibited not only the production of ROOH and ROH, but also any phytoalexin accumulation following invasion by P. oryzae. Chlorogenic acid, by inhibiting the peroxidase of rice plants, inhibited the production of ROH and the rice phytoalexins accompanying an accumulation of ROOM These data suggest that the oxygenated fatty acids, especially the hydroxides of linoleic and linolenic acids, in blast-infected rice leaves possibly act as endogenous elicitors of phytoalexin production.
社団法人日本農芸化学会の論文
1991-04-23